Presser-device for sewing machines



2 Sheets-Sheet 1 Filed April 26. 1929 May 5, 1931. R BECKER 1,803,930

PRESSER DEVICE FOR SEWING MACHINES Filed April 26, 1929 2 Sheets-Sheet 2 Patented May .5, 1931 RUDOLPH BECKER, OF NGRTH PLAINFIELD, NEW JERSEY, ASSIGNOB TO THE SINGER MANUFACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY PRESSER-DEVICE FOR SEW'ING MACHINES Application filed April 26,

This invention relates to sewing machine resser-devices of the type between which and a feeding device the work is gripped for the feeding action. It relates more particularly to presser-devices for sewing machines de signed to finish the edge of a hat sweat-band preparatory to the sewing of the sweat-band to the hat. In finishing the edge of a hat sweat-band, it is customary to enclose a reed lo-or wire in a longitudinally folded strip of bias-cambric and whip-stitch it to the edge of the sweat-band by an overseam enclosing the reed or wire and the fold of the cambric strip. Sweat-bands of certain materials, such 15 as imitation leathers, are diflicult to finish on a sewing machine equipped wi h an ordinary resser-foot, as the friction between the presser-foot and the surface coating of the sweatband generates enough heat to render the sur- 2 face coating gummy or sticky, thus interfering with the feed of the work.

The present invention has for an object to provide a sewing machine presser-device which will permit of the free feeding of the work under it. 'Another object of the invention is to provide a resser-device which will tend to maintain the edge of the work in engagement with an edge-guice in advance of the stitching point. A further object of the invention is to provide a free running presser-disk which will permit the sewing needle or needles to be placed reasonably close to the feed-dog but not within the periphery of said disk, and which will not interfere with the lateral motion of any thread-looping implement which may be employed in cooperation with the needle or needles above the Work.

To the attainment of the ends in view, a

rotary presser-wheel or disk is used which, instead of being arranged to bear edgewise or peripherally upon the work, as heretofore, is laid over, away from the vertical plane of the line of seam-formation, so as to bear upon the work fiatwise or facially, directly over the straight-away feeding element and in rear of the sewing point, so that the work will be gripped by the opposed pressures of the feeding element and the lower face of the Presser-disk. This novel construction and 1928. Serial No. 358,187.

combination of a presser-disk with the stitchforming and feeding mechanism insures the free passage of the work beneath the presser and permits free lateral movement of any thread-looping implements which may be cooperatively related to the needles above the work. It also has a tendency to hold the work against the edge-guiding device.

It is preferred to lay the presser-disk over to a degree such that the axis of the disk not only intersects the throat-plate within the periphery of the disk projected upon the plane of the throat-plate but also stands at or near a position perpendicular to the plane of the throat-plate, so that the under or workengaging face of the presser-disk is substantially flat. It is also preferred to provide the bearing support for the Presser-wheel With one or more stationary auxiliary pressers extending to a point adjacent the needle or needles outside of the periphery of the presser-disk to serve as needle-stripping means. Such pressers, where in engagement with the work, are preferably not opposed to the feeddog and hence exert no drag-upon the work during the feeding action.

In the accompanying drawings Fig. 1 is a fragmentary end elevation of a sewing machine embodying the invention. Fig. 2 is a plan View of the parts adjacent the stitching point. Fig. 3 is a section on the line 33, Fig. 2. Fig. at is a vertical sectional View taken parallelto the line of feed and showing the presser-devic-e in elevation. Fig. 5 is a transverse vertical section on the line 55, of Fig. 2. Fig. 6 is an elevation and Fig. 7 is a plan view of the presser-device.

The invention, according to the preferred embodiment illustrated, is applied to a hatsweat sewing machine such as disclosed in the patent to Becker, No. 1,622,277, dated Mar. 29, 1927. The machine comprises a bed 1 having a raised cloth-plate 2, and throatplate 8 slotted to receive the usual straightaway feeding four-motion feed-clog 4:. The

machine has the usual head 5 whichcarries the presser-bar 6 and needle-bar 7; the latter carrying two threaded needles 8, one of which sews through and the other over the edge of the hat sweat-band 9, assho-wninFig. 2.

Cooperating with the needles 8 below the throat-plate 3 is the thread-carrying looper 10 which seizes thread-loops from the needles and concatenates such loops with loops of the looper-thread in a. manner well known in the art.

Cooperating with the needles 8, above the work, are laterally movingthread-looping 'mplements 11, 12 which are constructed and operated substantially in accordance with the disclosure in said Becker patent. The curved implement 11 is carried by the bar 13 which slides longitudinally in the block l l pivoted 15 and is connected at 16 to the lever 17 actuated by the cam 18. The implement 12 is carried by one arm 19of a bell-crank lever fulcrumed at 20; the other arm 21 of such lever being actuated by the cam 22.

Detachably mounted on the presser-bar 6 by the screw 23 is the shank 24 of the bearingsupport 25 for the axle 26 of the presserwheel 26 having a peripheral edge-portion 26*. A ball-thrust bearing 2'? is provided between the wheel 26 and the support 25. The under or work-engaging face 28 of the wheel 26 is preferably in the form of a very broad truncated cone, so broad in fact as to be substantially flat. The axle 26 of the wheel is preferably directed at an angle of nearly but not quite 90 to the plane of the throat-plates so that the pressure of the wheel will be shifted or concentrated at one side upon the portion of the throat-plate 3 through which the feed-dog 4 operates.

Presserwheels of the prior art have a peripheral contact with the work due to the fact that their axes are inclined to the throatplate at angles of less than 45. The present presser-whee'l has a facial contact with the work since its axis is inclined at an angle of more than 45 to the throat-plate.

It will be observed that the apex of the conical under face of the presser-disk is within the periphery of the disk projected upon the throat-plate. This is another novel distin ction of the present presser-disk over those of the prior art.

The bearing-support 25 is extended forwardly in the form of an arm 28 to the free end of which is secured by the screw 29 the auxiliary presser or stripper 30 which is notched at 31, 7, to embrace the needle.

8 which sews through the work 9.

Projecting forwardly from the shank 24 is a second auxiliary presser 32 which is cut out along one edge 33 to fit the periphery of the presserdis 26. The presser 32 has a front edge-portion 34 terminating closely in rear of the needles 8 and cooperating with the notch 31 to strip the work from the needle or needles. It also has a tapered toe-portion 35, Fig. 2, underlying the thread-looping implement 12 and serving to lift the latter about its pivot 36 whenthe presser is lifted.

The machine is preferably provided with a suitable folder for the bias-cambric strip 37 and wire 38 which are positioned at the delivery end of the folder by the edge-guide 39, overlying which is an edge-guide 40 for the hat sweat-band 9.

When the feed-dog 4 rises, Fig. 5, it grips the work and presses the latter upwardly against the under face 28 of the presser-disk 26. The under faces of the auxiliary pressers 30 and 32, not being opposed to the portion of the work engaged by the feed-dog, exert no drag upon the work during the feeding stroke of the feed-dog.

The pressure of the presser-disk upon the work is greatest along the radial line aa, Fig. 7. T he slight amount of friction or slippage of the straight moving work relative to the circularly moving presser tends to rotate the work about the axis of the presserdisk and hence to retain the work against the edge-guiding means in advance of the sewing point.

On account of the flat or horizontal dis position of the presser-wheel 26 it does not interfere with the horizontal movement above it of the thread-looping implement 11, Fig. 5. it also permits free passage of the work beneath it, even tho-ugh the surface of. the work is of a frictional nature.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, the combination with stitch-forming mechanism including a reciprocatingneedle and a feeding device, of a presser-disk having a peripheral edgeportion and an under face and disposed with its under face cooperatively opposed to said feeding device in rear of said needle.

2. In a sewing machine, the combination with a reciprocating needle, a throat-plate and a feeding device, of apresser-disk disposed above and opposed to said throat-plate and feeding device and mounted to turn on an axis directed at an angle of more than 45 to the plane of said throat-plate and to one side of the needle-path.

3. In a sewing machine the combination with a reciprocating needle, a throat-plate and a feeding device, of a-rotary presserdisk having a substantiallyflat under face opposed to said feeding device, the axis of rotation of said presser-disk being within the periphery of said disk projected upon the plane of said throat-plate and at one side of the line of seam-formation.

l. In a sewing machine, the combination with a throat-plate and feeding device, of a.

rotary presser-disk opposed to said feeding device and disposed in a plane inclined slight-. ly to the throat-plate so .as to press upon the work with its under face.

5. A sewing machine having a throatplate and stitch-forming mechanism including a reciprocating needle and a thread-looping implement moving laterally of the needle You above the throat-plate, a feed-dog, and a rotary presser-disk having its under face opposed to said feed-dog and underlapping the path of movement of said thread-looping implement.

6. In a sewing machine, the combination with stitch-forming mechanism including a reciprocating needle, and straight-away feeding mechanism including a feeding element, of an edge-guide disposed in advance of the needle, and a rotary presser-disk bearing flat-wise of itself upon the work directly over said feeding element in rear of the needle.

7. In a sewing machine, the combination with a reciprocating needle, a slotted throatplate, and a straight-away feeding feed-dog operating through the slotted throat-plate, of a resser-device including a vertically movable presser-bar and a rotary presser-disk carried by said presser-bar and having its axis disposed uprightly at one side of the needle-path, said disk being arranged so as to press fiatwise of itself with its under face upon the portion of the work engaged by said feed-dog.

8. In a sewing machine, the combination with a reciprocating needle, a slotted throatplate, and a straight-away feeding feed-dog operating through the slotted throat-plate, of a presser-device including a vertically movable presser-bar and a rotary presserdisk carried by said presser-bar and having its axis disposed uprightly at one side of the needle-path, said disk being arranged so as to press fiatwise of itself with its under face upon the portion of the work engaged by said feed-dog, said presser-bar having fixed tEo it a forwardly extending auxiliary presseroot.

In testimony whereof, I have signed my name to this specification.

RUDOLPH BECKER. 

